performance · FF-0155

How do bore and stroke increase a Flathead's torque?

Steve explains that a bigger bore gives combustion pressure more piston area to act on, so the same pressure makes more force, and a longer stroke gives that force more leverage on the crankshaft, like a cheater bar on a breaker bar. Both raise torque.

Expert

Steve Coppock

Evidence

expert attributed

Component

cylinder bore and crankshaft stroke

Applicable scope

Performance Ford Flathead V8 build as described by Steve Coppock